Ok thanks for the info everyone!
I'm building a small mower to be pulled behind a tractor to mow a single 30" row down to about 4" tall. I took a push lawn mower and mounted it onto some forks for the 3 point hitch. That worked well, but we are going through the motor fast because of the extreme operating conditions, those little mowers aren't made to handle the thick vegetation and tons of dust i guess. Plus we have to stop every 20 mins to fill the thing back up with gas. I thought if i could find a right angled gearbox, that doesn't reduce the rpms, I could just turn the blade with that. I'm having trouble finding one though, all I can find is a 1:1 ratio gearbox. Does anyone have any other ideas that might work? Thanks